#define _CRT_SECURE_NO_WARNINGS 1
#include <cmath>
#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include<math.h>
#include<stdlib.h>
#include<stdio.h>
using namespace std;

class Solution {
public:
    int mySqrt(int x) {
        if (x < 1) return 0;
        long long left = 0, right = x;
        while (left < right)
        {
            long long mid = left + (right - left + 1) / 2;
            if (mid * mid <= x) left = mid;
            else if (mid * mid > x) right = mid - 1;
        }
        return left;
    }
};

int main()
{
    return 0;
}